Help identify lens mounts

I got these 2 lens for a decent price: Formula 5 MC 200mm f3.5 and Konica Hexanon AR 50mm f1.7 (and some 6 filters), but I have problem identify the lens mount on the Formula 5 lens, I know the Hexanon is an AR mount (tell me if I'm wrong). As these two come from the same seller, and the mounts seem to be similar, so I'm wondering if the Formula 5 is also an AR mount?

MC means 'multicoated', it has nothing to do with lens mounts. I'm pretty sure both lenses are Konica AR mount.

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That lens definitely comes in a M42 mount, I googled it so i guess there are different versions, sorry for any confusion. On closer inspection the pin is on the other side from what an M42 is but apart from that they look identical. Does it matter where the pin is located? The reason i ask is without any expertise in the M42 mount these lenses still beg the question why one has a protruding piece of metal on the inner diameter and one doesn't? I'm only thinking of it logically but again i'm no expert just trying to help.
Edit just to clarify *opposite side from the keyed bayonet partial flange*

M42 is not a bayonet mount nor breech so you would not see flanges in the mount. It is a simple 42 screw mount so you would see threads instead. Later M42 mount lenses incorporated auto-stop down metering... The pin on those M42 mounts is used to stop down the aperture diaphragm.... As with the famous Spotmatics

Modern bayonet mounts went through a similar iteration... Many were first designed with aperture preset. Then incorporated auto stop down aperture diaphragm using a lever as the linkage between camera and lens. Then they incorporated metering that was taken with the lens wide open but required the aperture ring position to be communicated to the camera. This was often done through another lever linkage that moved exactly with aperture ring positioning. Of course designs are different from between mount types... but in general. .. There is a mechanical connection that stops down the aperture diaphragm and another that relays aperture ri g positioning for those that support wide open ttl metering.

That lens definitely comes in a M42 mount, I googled it so i guess there are different versions, sorry for any confusion. On closer inspection the pin is on the other side from what an M42 is but apart from that they look identical. Does it matter where the pin is located? The reason i ask is without any expertise in the M42 mount these lenses still beg the question why one has a protruding piece of metal on the inner diameter and one doesn't?

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Here's an M42 next to a Konica AR. An M42 is always a screw thread, but not all screw threads are M42's. However, if you measure the diameter across the threads, it's almost 42 mm. Meanwhile, the AR is a bayonet, and we know it's an AR by the notch in one bayonet flange and its position relative to the arm. Some other mounts also have notches so you have to look at where it is. That's basically how you recognize mounts. You have one you know and if it looks like the unknown lens, then that's all.

You're asking why the Konica has the metal fence next to the sliding lever that works the aperture? It could be a light shield around the arm to prevent reflections. It could be a guide to help restrain the matching lever in the camera that contacts this arm. I don't know, but it is common for a third party lens maker to eliminate things like this if they figure its not needed.

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I think the notched bayonet flange is fairly conclusive.
From my browsing on different mounts there are only two that have notches, The AR with it near the middle and the Minolta MC/MD where it is right at one end of the flange.
I've found the following link helpful with lens mounts. Though I'd find a table with actual characteristic measurements / features a great help on being sure.

Your right I have miss read something on the web it's NOT a M42 mount, for some reason i had it in my head that MC/MD lenses are but I'm mistaken. For anyone reading this that might be interested in old Minolta mounts (The MC could stand for Meter Coupling) it is one iteration of the Minolta SR mount. SR/MC/MD&MD X-600 are all interchangeable i.e. backward compatible.
Check this wiki on it http://en.wikipedia.org/wiki/Minolta_SR-mount

You're asking why the Konica has the metal fence next to the sliding lever that works the aperture? It could be a light shield around the arm to prevent reflections. ...

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Konica may have chosen to use a "fence" rather than a simple pin to avoid reflections, but the main purpose of the "fence" involves the position of the knotch on one end (far side in your pic) which signals the lens' maximum aperture to the body. The OP's 3rd party lens, which is also in Konica AR mount, uses a simple fixed pin for this purpose.

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